Dust collector



F. H. WAGNER DUST COLLECTOR `lune 23, 1936.

Filed Jan.

2 Sheets-Sheet l Gttornegs F. H. WAGNER DUST COLLECTOR June 23, 1936.

Filed Jan. 17, 1935 2 Sheets-Sheet 2 I Patented AJune 23, 1936 UNITED STATES DUST COLLECTOR Frederick H. Wagner,

Md., a corporat to The Bartlettayward Company,

n Application Jan 8 Claims.

This invention pertains to dust collectors, and particularly to collectors of the centrifugal type, and preferably one in which the coarser particles are initially separated from the gas stream prior to the removal of the fine particles therefrom.

The main object vof the invention is to produce not only a new form of apparatus whereinthe coarser dust particles are removed from the gas stream, butalso to provide a new type of separacase that notwithstanding vain pressure of the gas stream, particles are prevented from into the stream of cleaned ing such in each riations or drop the separated dust being drawn back gas.

With these and other objects and advantages in viewreference will be had to the annexed drawings, wherein:

Figure 1 is a vertical sectional view of one form of apparatus embodying my invention;

Fig. 2, a horizontal sectional view on the line II-lI of Fig. 1;

Fig. 3, an enlarged sectional elevation of the lower portion of the fine dust separating means;

Fig. 4, a transverse sectional view on the line IV-IV of Fig. 3;

Fig. 5, a vertical sectional View on the line Fig. 6, a similar view of one of the tubular dust separating elements with the cut-off valves 'there for shown as open; and

Fig. '7, a vertical sectional view on an enlarged scale of the-'upper portion of such element and the associated valve actuating means.

lInthe drawings, the main body of the apparatus vis shown as hollow and rectangular in.

cross section (see Fig. 2) and is formed by vertically disposed sides and ends Ill, two funnelshaped bottom sections II and I2, open at their lowerr ends, and a cover plate I3. Said plate I3 forms the bottom of a chamber I4 the side walls whereof are denoted by I5, while the top appears as I6. Suitable sustaining spacers I1 are interposed between elements I3 and I6 and their upper ends are preferably in line with the lower end or base of a hollow column-like member I8 placed centrally of top I6. y

Said memberv forms the support for the initial dustyseparating or extracting means, the construction and form of which will be best understood upon reference to Figs. 1 and 2. It may be said to ,comprise a tubular member I9 closed Vat its top and open at its bottom, the inlet whereof is at 20, while the discharge end terminates 55 or opens into the upper end of a trunk or duct tor for the fine particles, the arrangement be Baltimore, Md., assignor Baltimore,

not Maryland ry 11, 1935', serial No. 2,296

(ci. iss-85) I 2I, which at its lower endppens directly into chamber I4. p The innermost wall of the member I9 takes the form of a closed cylinder as 22 and located within and extending throughout the ymember I9 is a series of vertically disposed partitions 23, said partitions or walls being equidistantly spaced from each other and the walls of the member I9. Said partitions or walls at their inner portions circle orcurve about member 22 with the axis thereof as a center, forming a series of passageways or chambers 24 open at 'their lower ends, which communicate with a funnel-shaped chamber 25, the upper end whereof is col-extensive with the open lower `portion of the tubular member I9. A discharge pipe dust particles (mostly coarse) extends downwardly from the lower end of `member 25 rvrand tout through the bottom of the"structure"-(`s'e`e Fig. 1). v Bailie plates or inclined aprons 23EL and 231i yare arranged in each passageway, the formerlying in a plane above the latter and the lowervdge of each stopping short of the wall or partition toward which it projects. The angley of inclination of the vaprons is" such that dust which is thrown out of the gas stream will, when it contacts them, slide, downwardly and 'into hopper 25 and out through discharge pipe 26. A vortical action is, of course, imparted to the various sub-divisions of the gas stream as the gas is forced or drawn through the passageways, which vaction serves to arrest andA remove the larger dust particles. The gas thus partially cleaned enters duct 2I andl passes into chamber i4, heretofore described.

Extending downwardly from said chamber and in direct communication therewith is a-series of fine dustA extracting elements, said associated partsl being alike in form and similarly lettered throughout.

Secured to the under face of plate I3 in line with an opening formed therein is a tubular member 21, the lower end whereof extends into a sleeve 28 extending upwardly from and opening into a 26 for separated elements and `trunk or chamber 29 extending longitudinally lof L outlet 3i andfwhere a plurality of trunks are ern- `ployed, they may be connected to a manifold. v Aflxed to and extending centrally and downwardly'through the major length of tube 21 and its lower extension or section 21a is a smaller tube 32, to which is ailixed a worm-like flight or member 33, said member stopping short of the lower end of the tube section 21e. Said tube 21--21i is imperforate throughout its length except for dust passage slits or openings 34 (Figs. 4 and '6) adjacent the upper end of section 21. Surrounding tube 21 at this portion and in spaced relation thereto is a cylindrical member or skirt 33, the lower end whereof opens, into the body I 0, while the upper end is closed, as best seenvin Figs. 3 and 6.

Each dust passage 34 is formed at the base orl inner vedge of a vertically disposed plate 33, said plates (see Fig. 4) extending outwardly from one side of the passages in a direction tangential to the tube 21.. The upper edge of each plate, moreover, merges into a helical or spiral plate 31 which at its upper end is formed integral with a header 33. Said helical plate (see more particularly Fig. 3) may be said to start at a and to extend around the tube 21, oneV or more turns. Such night or helix is also, as will be best noted upon reference to Fig. 3, of such width as toextend completely across the space between the skirt 33 and the tube section 21.. f

Under some circumstances, it may be advisable to shut down one or more of the tubes 21--21l and the allied parts, which, of course. would naturally cut down the capacity of the flne dust separating means.- To this end, two valves as 4i and 42 are utilized (see Fig. 6), the former being attached to the lower end of a rod 43, and the latter to the lower end of, a tubular member 44.

A bushing 43 having a polygonal opening complemental to the cross section of the rod is secured in the upper end of tube 32 and prevents the rod from turning while still being free to be moved therethrough. 'Ihe upper portion of rod 43 is threaded, as is the upper external surface of the tubular member, the threads being right and left, respectively.

A column-like member 43 is secured to and exltends upwardly from plate I3, surrounding member 44 and having secured in its upper end a nut 41 with which the member 44 engages and through which it extends. At its upper end member 44 has secured thereto an over-travel nut, embodying a socketed head or hand piece 43, a nut proper 48 threadedon the outer end of rod 43, and a yielding connection between the head andnut comprising a stake 5I with an encircling spring 32. Such arrangement permits one valve to seat in advance of the other, and the latter to be' closed without dimcu'lty or any strain upon the parts.

While the valve closing means has been shown in con junction with one r'ow of extractor tubes, valves and actuating mechanism as above set forth may be utilized' with others.

It is thought that the operation and functioning of the parts will be readily appreciated from the foregoing, but a brief Vrsum will be given.

Dust laden gas is introduced into the centrifugal separator through inlet 20, and is immediately divided into a series of streams, each of which partakes of a Aswirling action on its way to the duct 2|, which, of course, throws the heavier dust particles at least against the outermost wall of eachduct. The dust lgravitates, sliding onto and then olf of the ,apron 23', the upper apron f precluding reow or upward movement of the gas stream and, likewise, acting to ing dust-laden gas against the deflect the incomouter wall. Such dust as is separated by this centrifugal passes into member 25 and is finally discharged through pipe 28.

Where the gas is relatively free of coarse dust particles, the centrifugal may be omitted and the gas to be cleaned introduced directly into the 5 chamber I4 for treatment in one or more of the so-called tubular separators. From said duct or chamber I4, the gas passes into the upper end of tube 21 wherein it contacts the helix 33, which by reason of the swirling action that'it impartsto the gas stream, acts to throw the dust particles outwardly into contact with the inner wall of the tube along and down which they gravitate and are advanced by the gas stream. l

The particles ilnally reach the lower section 21* of the tube and are thrown outwardly through the slots or openings 34 and into contact with the tangentially disposed wings or vanes 38, which act to arrest the dust particles, such particles moving outwardly and downwardly of wing's 36 finally 20 dropping through the skirt 35 and to the underlying chamber. Meanwhile, the cleaned gas passes from the lower end of the tube into the trunk 23.

It will be observed that wherever an inclined 25 surface is present in the path of movement of the gas stream, its angle is such that the dust will be freely movable thereover by the stream or as with the upper portions of the trunks or chambers 29, the angle of inclination insures gravita- 30 tion of the dust particles therefrom. Preferably the lower section of the tubular separator. or that portion heretofore denominated as 21, together with the associated elements, to wit, the wings or plates 3B and the overlying helix 31, 35 will be made of abrasion-resistant material, inasmuch as these parts are the ones which are subjected to the greatest wear. l

What is claimed is:

1. In a dust separator, the combination of a 40 duct into which the gas to be cleaned is passed, said duct having at least one slot formed in thel wall thereof; a plate extending freelyl into space and tangentially outward of the duct and to one side of the slot; and means for imparting a swirling movement to the gas stream as it passes through the duct, whereby the dust particles will be caused to move outwardly of the slot.` impinge upon the plate and be arrested thereby, finally moving over and of! the surface of the plate to the space below.

2. In a dust separator, the combination of a duct intowhich the gas to be cleaned is passed: a skirt surrounding the lower portion thereof and spaced laterally with relation thereto and open at its lower end; a helical plate located in the upper lportion of the skirt, bridging the space between Asaid duct and and forming a helical passage about the duct, there being a series of elongated longitudinally extending slots opening through the. wall of the duct into said passage: and a plate extending' freely into space and outwardly in a tangential direction from said duct and to one side of and adjacent each slot, the 65 plate at its upper edge merging into the helical plate aforesaid and the outer edge being spaced from the skirt.

3. In a dust separator. the combination of a duct; a Vhelix mounted therein and forming a helical passageway through which the gas is caused to pass, there being a series of slots' open-1 \ing into the duct adjacent the lower portion of the helix: a skirt surrounding the lower portion of the duct and spaced laterally with relation 75 thereto; a helix bridging the space between the outer wall of the duct and the inner wall of the skirt, said helix-being coincident in position with the helix in the duct; and a series of plates extending tangentially from the duct into the space between the same and the skirt, there being one such plate for each opening.

4. A structure as set forth in claim 3, wherein the plates are connected at their upper ends to the last-named helix and stop short of the skirt at the outer edges.

5. In a dust separator, the combination of a duct into which the gas to be cleaned is passed; means located within the duct for imparting a swirling movement to the dust stream'as it passes through the same; a series of longitudinally disposed slots formed in the wall of the duct adjacent the lower portion thereof, the walls of said slots standing in a substantial tangential relation to the axis of the duct; a plate extending outwardly from the .duct to one side of each of said slots, each of said plates likewise standing tangentially with reference to the duct; and a helix surrounding said duct, said helix being connected to the upper edges of the aforesaid plates.

6. In a dust separator, the combination of a duct into which the gas to be cleaned is passed; a helix extending substantially throughout the length of said duct, the wall of the duct adjacent its lower end being provided with a series of longitudinally disposed slots, the walls whereof stand in a substantial tangential relation to the duct, said slots in longitudinal position following the helix aforesaid; a skirt surrounding the lower end of the duct and spaced laterally'with relation thereto and open at its lower end; and a helical plate mounted within the upper portion of the skirt and surrounding the duct, the convolutions of said last-named helix being substan- 5 tially coincident with that mounted within the duct and forming a'channel extending around the duct and into which the slots open.

7. A structure as' set forth in claim 6, wherein plates extend tangentially from the duct adjacent each of said openings, said plates at their upper edges merging into the last-named helix and stopping short at their outer edges of theskirt.

8. In an apparatus for separating dust from gases, the combination of a centrifugal separator for removing the coarser particle from the gas stream; an off-take for the partially cleaned gas, said off-take communicating with a chamber; at least one tubular member extending downwardly from said chamber and being in communication at its lower end with a cleaned gas oil-take; means mounted within said tubular member for imparting a swirling movement to the .gas stream passing downwardly there- 25 through; and means embodying a plurality of flat plates located adjacent the lower end of said tubular member and prior to its entrance into the cleaned gas off-take for separating the fine dust particles from the gas stream through the 30 centrifugal action imparted to the stream in its passage downwardly through the tubular member.

FREDERICK H. WAGNER. 

